Machine Learning Isn't Data Science

Too often, Machine Learning is used synonymously with Data Science. Before I knew what both of these terms were, I simply thought that Data Science was just some new faddish word for Machine Learning. Over time though, I've come to appreciate the real differences in these terms. I've always wondered how misconceptions like these endure for so long -- my current working hypothesis: people are deathly afraid of looking stupid. Too afraid of asking someone "what is machine learning?